I second the comment to pull ahead. Pull far enough up so a big rig can get his tanks fillers on the pumps and then complete your payment process. If you are going to buy something or use the restrooms, pull over to a truck parking area and walk back. Truckers understand the problems of handling a trailer, but time is money to them. I have never (14 years) had one give me a hard time about using the truck lanes but I always try to stay out of their way.
A note on pumps. If a lane has pumps on both sides, one will be the "master" and the other the "slave". The island will be marked as to which way to enter and exit, either on the overhead or on the pavement. If you go through in the correct direction the pump on the driver's side is the master. That is the one RVers want to use. The master must be on before the slave can be activated and the gallons and dollars usually only appear on the master. You can fill from the slave, but it is a PITA.
Have fun out there. Don't worry about it, just do it!
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